"アジド・ゴーシュ効果"は,アジドプロリンの形状に関する意味合いがある
Louis-Sebastian Sonntag1, Sabine Schweizer, Christian Ochsenfeld
1Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland.
Journal of the American Chemical Society
|November 9, 2006
まとめ
アジド・ガウチ効果は,アジドプロリン誘導体の形状に影響を与え,特定のリング形状を好みます. これはアミドの安定性やペプチドサイクリングに影響を及ぼし,フッ素のガッチ効果に匹敵する効果をもたらします.
科学分野:
- コンピューティング・ケミストリー
- 有機化学 オーガニック・ケミストリー
- 構造生物学 構造生物学とは
背景:
- ガッチ効果は,特定の化学構造において,アンチアレンジメントよりもガッチアレンジメントを好む構造的好みを記述する.
- アジドプロリン (Azp) デリバティブは,ペプチド化学と薬剤設計における潜在的な応用を持つアミノ酸アナログです.
- Azpの構成的行動を理解することは,ペプチドの構造と機能を予測するために重要である.
研究 の 目的:
- (4R) -および (4S) -アジドプロリン誘導体の形状に対する"アジド・ガウチ効果"の影響を調査する.
- この効果がアミドコンフォーマーの比率とペプチドサイクル化の傾向に与える影響を理論的かつ実験的に決定する.
- アジドガウチ効果の強さを,よく知られているフッ素ガウチ効果と比較するために.
主な方法:
- (4R) -および (4S) -アジドプロリン誘導体の実験試験.
- アブ・イニシオ計算を用いた理論分析.
- ピロリジン環とアミド結合の適合分析.
- s-trans:s-cisアミドコンフォーマーの比率の決定.
主要な成果:
- アジド・ガッシェ効果は, (4R) Azp誘導体のC(4) -exo構成を決定し,n-->pi相互作用を通じてs-トランスアミド構成器を安定させます.
- (4S) Azpの誘導体は,この安定作用を欠き,より低いs-trans:s-cis比率を示し,C(4) -endo形状を採用する.
- 計算によると,アジドエタン効果の強さは,フッ素効果と同等で,エネルギー差は5〜13kJmol (−1) で,アジドエタン誘導体のガウチ形状が好ましい.
結論:
- (4R) Azp誘導体は,アジド・ガウチ効果により (4S) Azp誘導体と比較して,s-トランスアミドコンフォマーに対するより高い好みを示しています.
- 形状的好みは,Aspを含むペプチドが,すべてのcisアミド結合を持つサイクル構造を形成する傾向に影響します.
- アジド・ガウチ効果は,アジドプロリン誘導体における重要な構成決定因子であり,ペプチド構造と合成に影響を及ぼします.
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